How to cover code for catch block in Apex

Sometime developer needs to cover the catch part in the Apex Class.

Code Snippet:

try{

    Account acc = new Account();    

    acc.Name = 'Test';    

    Database.insert (tempList,false);

}

catch(exception e){

    LogObj obj = new LogObj();

    obj.error = e.getMessage();

    insert obj;

}

To cover the catch, we can modify the code as shown:

try{

    boolean allOrNone = false;

    Account acc = new Account();    

    acc.Name = 'Test';    

    Database.insert (tempList, allOrNone );

    if(Test.isRunningTest()){

        Database.insert (tempList, 0);

    }

}

catch(exception e){

    LogObj obj = new LogObj();

    obj.error = e.getMessage();

    insert obj;

}

In this case, code will run the Database.insert (tempList, 0); line and will eventually fail and code will go to catch block.

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